help me ,please.

题目

help me ,please.
1.no bread eaten by man is so sweet as that earned by his own labor 为什么用that?one 或 what 为什么不行?
2.you can not imagine the hard time he had holding the horse in
为什么用holding?怎么翻译?
3.I have kept the portrait where I can see it every day,as it always remind me of my university days in London 为什么用where?in which为什么不行?
4.it is quite warm today for january.为什么用for?怎么翻译?

答案

1.no bread eaten by man is so sweet as that earned by his own labor 为什么用that?one 或 what 为什么不行?首先,bread是不可数名词,用one肯定是不行的.其次,这是一个定语从句,如果还原为正常语句应该是:No bread...